Attachment member and a dental restoration

Abstract

A combination of a dental restoration and a plurality of attachment members is disclosed. The dental restoration includes a plurality of support members configured to be releasably attached to an attachment member. Each attachment member includes a first support surface facing in the coronal direction of the attachment member for supporting a corresponding support member, and a second support surface facing in the apical direction of the attachment member and towards the longitudinal axis of the support member and being configured for engagement with a support surface of a dental fixture. Each attachment member includes an attachment portion at a coronal portion for receiving a fastening member for releasably attaching one of the support members. The first support surface has an angle relative the longitudinal axis of the attachment member measured from its apical towards its coronal end that is larger than a corresponding angle of the second support surface.

1 . A combination comprising:
 a dental restoration; and   a plurality of attachment members,   wherein the dental restoration comprises a plurality of support members, each support member being configured to be releasably attached to an attachment member,   wherein each attachment member comprises a first support surface facing in the coronal direction of the attachment member for supporting a corresponding support member of the dental restoration, a second support surface facing in the apical direction of the attachment member and towards the longitudinal axis of the support member and being configured for engagement with a support surface of a dental fixture, and an attachment portion at a coronal portion thereof for receiving a fastening member for releasably attaching one of the support members, and wherein the first support surface has an angle relative the longitudinal axis of the attachment member measured from its apical towards its coronal end that is larger than a corresponding angle of the second support surface.   
     
     
         2 . The combination according to  claim 1 , wherein the first support surface is substantially perpendicular relative to the longitudinal axis of the attachment member, and the second support surface is non-perpendicular relative to the longitudinal axis of the attachment member. 
     
     
         3 . The combination according to  claim 1 , wherein the axial distance, measured in the direction of the longitudinal axis of the attachment member, between the first support surface and a coronal end of the second support surface is in the range of about 0.05 mm to about 0.35 mm. 
     
     
         4 . The combination according to  claim 1 , wherein the axial distance, measured in the direction of the longitudinal axis of the attachment member, between the first support surface and an apical end of the second support surface is in the range of about 0.65 mm to about 1.30 mm. 
     
     
         5 . The combination according to  claim 1 , wherein the attachment member comprises a substantially rotationally symmetrical portion at an apical end thereof, which is configured to be received in an internal cavity of the dental fixture. 
     
     
         6 . The combination according to  claim 4 , wherein an apical end of the substantially rotationally symmetrical portion has a diameter which is less than a diameter of a apical end of the second support surface, and the coronal end of the substantially rotationally symmetrical portion is located further towards the coronal end of the attachment member than the apical end of the second support surface. 
     
     
         7 . The combination according to  claim 1 , wherein each support member of the dental prosthesis comprises an annular end surface having a width, wherein each annular end surface is configured to be supported by the first support surface of one of the attachment members and be parallel with the first support surface. 
     
     
         8 . The combination according to  claim 1 , wherein the attachment member comprises a threaded end portion at the apical end thereof, and the attachment portion of the attachment member comprises an external surface including a tool engaging portion, which is non-rotationally symmetrical, and a rotationally symmetrical portion. 
     
     
         9 . The combination according to  claim 1 , wherein each attachment member comprises a face extending substantially parallel with the longitudinal axis of the attachment member and having a length extending between the outermost end of the first support surface and the apical end of the second support surface, wherein the length of the face measured in the direction of the longitudinal axis of the attachment member is in the range of about 0.65 mm to about 1.30 mm. 
     
     
         10 . The combination according to  claim 3 , wherein the axial distance, measured in the direction of the longitudinal axis of the attachment member, between the first support surface and the coronal end of the second support surface is in the range of about 0.15 mm to about 0.25 mm. 
     
     
         11 . The combination according to  claim 4 , wherein the axial distance, measured in the direction of the longitudinal axis of the attachment member, between the first support surface and the apical end of the second support surface is in the range of about 0.75 mm to about 0.95 mm. 
     
     
         12 . The combination according to  claim 4 , wherein the axial distance, measured in the direction of the longitudinal axis of the attachment member, between the first support surface and the apical end of the second support surface is in the range of about 0.75 mm to about 0.85 mm. 
     
     
         13 . The combination according to  claim 8 , wherein the tool engaging portion is a hexagonal. 
     
     
         14 . The combination according to  claim 8 , wherein the rotationally symmetrical portion includes a circumferential groove. 
     
     
         15 . The combination according to  claim 9 , wherein each attachment member comprises a face extending substantially parallel with the longitudinal axis of the attachment member and having a length extending between the outermost end of the first support surface and the apical end of the second support surface, wherein the length of the face measured in the direction of the longitudinal axis of the attachment member is in the range of about 0.75 mm to about 0.95 mm. 
     
     
         16 . The combination according to  claim 9 , wherein each attachment member comprises a face extending substantially parallel with the longitudinal axis of the attachment member and having a length extending between the outermost end of the first support surface and the apical end of the second support surface, wherein the length of the face measured in the direction of the longitudinal axis of the attachment member is in the range of about 0.75 mm to about 0.85 mm.